Cryptic crossword clue
One very still, regarding the equilibrium in the earth’s crust 9

The most common and most likely answer to this crossword clue is the 9 letter word ISOSTATIC

I've seen this crossword clue in Financial Times
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Buddy explains!

The straight part
We know that "garding the equilibrium in the earth’s crust" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case garding the equilibrium in the earth’s crust = isostatic.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does ISOSTATIC mean?

ISOSTATIC noun
  1. A line of constant stress.
  2. A state of equilibrium between two forces.
ISOSTATIC adjective
  1. Of or pertaining to isostasy or isostatics

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